A coiled, massless cord is pulled off a drum made of solid material with a radius of 20 cm and a mass of 10 kg (frictionless axis) with a constant force F=2.5.
a) How many revolutions does the drum make in the first 10 seconds?
b) Now the thread comes loose and the drum rotates freely. After a while, a snap mechanism engages and the rotation is slowed down by a torsion spring. This spring requires three turns before it brakes completely. Determine the righting moment (the angular righting amount) of the spring.